JPS5915884B2 - herbicide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a herbicide containing a mixture of active substances.

It is known that substituted benzoic acids and benzothiothiadiazinones have herbicidal activity.

However, its herbicidal action is not desirable as shown in the Examples below.

However, - (a) compounds of the formula (wherein R means a lower alkyl residue having up to 4 carbon atoms) or salts thereof, such as alkali-, alkaline-earth-, ammonium-, hydroxyalkyl-
or alkylammonium and hydrazine salts, such as sodium, lithium, potassium, calcium, iron, methylammonium, trimethylammonium, ethylammonium, jetanolammonium, ethanolammonium, dimethylamine, dimethylethanolamine, hydrazine or phenylhydrazine; (b) Formula (wherein X means halogen, methoxy or amino, n
means 1.2.3 or 4, in which case mixtures of the compounds methoxy and halogen or amino and halogen or methoxy, amino and halogen can be present simultaneously) are better herbicidal than the individual active substances. It is known to have an effect.

Active substances a and b can be used in amounts of 0.5 to 5 yu per hectare.

The mixing ratio of the active substances is 5:1 to 1:5, in particular 3:1 to 1:3 parts by weight.

The mixture is suitable for the control of undesirable plants such as dicotyledonous weeds, monocotyledonous non-herbaceous plants or sedges in the cultivation of useful plants such as cereals, rice, soybeans, onions, potatoes, peas and faba beans.

The mixture can be used in a pre-germination method and/or in a sub-germination method.

The active substances can be used as solutions, emulsions, suspensions, oil dispersions, sprays or granules.

The form of use is completely adapted to the intended use.

The form of use must in all cases ensure a fine distribution of the active substance.

In order to produce directly sprayable solutions, mineral oil fractions with medium or high boiling points, such as melt oil or diesel oil, can be used.
Also used are coal tar oil and oils of vegetable or animal origin, as well as cyclic hydrocarbons such as tetrahydronaphthalene and alkyl-substituted naphthalene.

Aqueous use forms can be prepared from emulsion concentrates, pastes or wettable powders (spray powders) by addition of water.

To produce emulsions, the substances can be mixed homogeneously in water with the aid of wetting or dispersing agents, either neat or dissolved in a solvent.

In addition, concentrates of active substance, wetting agents, adhesion agents, emulsifiers or dispersants and, if appropriate, solvents, can also be prepared, which are suitable for dilution with water.

Various types of oil can be added to the finished propellant.

Sprays can be produced by mixing or grinding together the active substance and a solid carrier material, such as clay or fertilizer.

Granules can be produced by binding the active substance to a solid carrier material.

Furthermore, oils can be used to prepare dispersions that can be directly sprayed.

The active substances can be mixed with fertilizers, pesticides, fungicides or other herbicides.

Examples of the herbicidal effect of the mixture of the present invention will be explained in comparison with a single agent.

Example 1 Plants, rice (0ryza 5ativa), soybean (
5ojahispida), Zea may
s),, wheat (Triticum aestivu)
m), millet (Echinochloacrus g
alli), Setariaf
aberii), edible) S-q sedge (Cyperus
Xantium pensylvanicum
), 5inapis arvensis
)%Alisma plantag
o -aquatica), Yaemugura (Gali
um aparine), Camille (Matrie)
ariacharnomilla), Sengarlic (
A lopecurus myosuroides) and one-year-old sparrowfly (Poa annus)
at a growth height of 4 to 20 crIL with the following individual active substances and mixtures thereof, each with 50 liters of water per hectare.
Treated as emulsion or dispersion in 0J: I 2,3,6-dichlorobenzoic acid, 0.5 and 2 kg of active substance per hectare ■ 2-methoxy-3,6-dichlorobenzoic acid, per hectare Active substance 1.5 and 2 kg III 3
-isopropyl-2,1,3-pen/”-thiadiazinone-(4)-2,2-dioxide, 0.5.1.1.5 active substance per hectare, r 2 and 3 kg I+ll 0 active substance per 11 ha .5 +1.
5g n10m 1.5 + 0.5 active substance per hectare
g It can be seen from the following Table 1 that the mixture exhibits a better effect on cultivated plant tolerance than the individual active substances after 8 to 14 days.

Regarding the test results in Table 1, herbicides are generally meaningless unless they completely or nearly completely damage the target plants.If they survive without being completely damaged, they will recover later and grow larger and cause more damage. Its effectiveness as a herbicide is halved.

On the other hand, there is a need for a herbicide with a broad spectrum of weeds that can kill as many types of weeds as possible with a single agent.

In other words, it is desired that herbicides completely kill target plants, do no harm to useful plants, and have a broad herbicidal spectrum that covers the target harmful plants.

From the above viewpoints, we will observe the test results, that is, the effects.

Herbicide 1, when used alone, does not show complete or near-complete damage to undesirable plants unless applied at 2 kg/ha, but at this amount it does not cause harm (20 kg/ha) to useful plants, such as wheat. )give.

Therefore, there is a problem in using 2 kg/ha.

Similarly, the desired effect cannot be obtained with the herbicide ① unless it is used at 2 kg/ha, but it is also harmful to the useful plant wheat (15), which is a problem.

That is, both drugs can only be used in amounts of 2 kg/ha or less, and on the other hand, they have the disadvantage that the desired effects cannot be obtained when used in amounts less than 2 kg/ha.

By the way, the desired effect cannot be obtained with the herbicide (3) unless it is used at a rate of 3 kg/ha, but even if this amount is used, it shows almost no herbicidal effect on Garlic and Psyllium.

However, when herbicide ■ or ■ is used as a mixture with herbicide ■, for example, ■ is 0.5 kg/ha, m is 1.5 to 9/ha, or ■ is 1.5 kg/ha.
When used in small amounts of 0.5 kg/ha, it is harmless to useful plants and can completely or nearly completely damage undesirable plants.

In other words, the chemicals of the present invention can completely or nearly completely damage undesirable plants over a wide range and in a much smaller amount than the amount required to achieve the desired effect with each individual chemical.
Moreover, it does not cause any phytotoxicity to useful plants.

The basis for the occurrence of such a mutual effect is not clear whether it is based on increased permeability or the final formation of a tertiary component, but it is clear that the basis for the occurrence of such a mutual effect is extremely significant. It is clear that this is due to the results.

Example 2 Plants cultivated after germination in open field, soybean (5 ojahisp
ida) and Zea mays and undesirable plants, Millet (Echinochloa cr
us galli), Akinoeno=rogusa (5et
aria faberii), edible sedge (Cy
perus esculentus), Xantium pensylv (5inapis arvensis),
anicum), Yaemugura (Galium ap)
arine), Camille (Matricariach)
amomilla), German raw barley (Loliu
mperenne) and Great Sparrow (Poa
trivialis) was treated with the following individual active substances and mixtures thereof: 13-isopropyl-2,1,3-benzo-thiadiazinone-(4)-2,2-dioxide, 0.7 active substance per hectare and 2kg ■ 3-Amino-2・5-
Dichlorobenzoic acid, 1. active substance per hectare.
3 and 2 kg 1+■ 0.0 active substance per hectare.
7 + 1.3 g After 10-14 days, mixture I + I [is the individual active substance ■
It was confirmed that it showed better reactivity in cultivated plants and better herbicidal action than those of (1) and (2).

The test results can be seen from Table 2 below.

Regarding the test results in Table 2, it is recognized that, as described in Table 1 of Example 1, a very significant synergistic effect is exhibited.

Drug I showed a damage rate of 75.80.90.80.80 for edible Japanese porphyry, Japanese turmeric, Pennsylvanian mullet, and Camille only after 2 kg/ha was used, but it had a damage rate of 75.80.90.80.80 for German raw barley and Psyllium japonica. The damage rate is O.

On the other hand, when the drug ■ is used at 2 kg/ha, it shows a damage rate of 80.70.80 against Aquinofolia, German native wheat, and Psyllium japonica, but it also shows a damage rate of 80.70.80 on edible Japanese commonweed, Nogarashi, Pennsylvanian firium, and Yaemugura.
It only shows a damage ratio of 10.30.10.10.10 for Camille.

Therefore, assuming that there is no mutual effect, considering it additively, I is 2 kg/ha, J is 2 kg/ha, or a total of 4
kl? 100 or 100 by using / ha
However, as shown in the table, if I is set to 0.
7kg/ha, [I 1.3kg/ha total 2kg/ha]
ha, that is, half of the required usage amount of 4 kg/ha, that is, an extremely small amount, can be used to reduce the amount of red foxtail, edible red mullet, cypress, Pennsylvania staghorn, Japanese snail, Camille, German raw barley, and large sycamore. 90.90 for each
．． It shows a damage ratio of 100.100.85.95.70.90, that is, a complete or nearly complete damage ratio, and does not cause any harm to useful plants such as soybean and corn.

As described above, it can be seen that the herbicide of the present invention exhibits a remarkable synergistic effect in this example as well.

Example 3 Barley (Hordeum), rye (5 eca
le ), wheat (Triticum aestivum
) and the undesirable plant Ga
lium aparine) and sennin 0li (A
After germination of L. lopecurus myosuroides, these plants and the ground are treated with the following single substances and mixtures thereof.

A 3-f sopropyl-2,1,3-benzothiadiazinone-(4) -2,2-dioxide active substance 0.5
．． 0.75, ■, 0, i, 5 kg/haB 2.
5-Dichloro-6-methoxybenzoic acid (dimethylammonium salt) active substance 0.5.0.75.1.0.1.
5kg/ha ~A+B 0.5+1.0.1.0+0.5.0.7
5+0, 75 kg/ha After 10-14 days, it was confirmed that the mixture had significantly better herbicidal activity on cultivated plants under the same conditions.

The test results are shown in Table 3 below. Regarding the test results in Table 3, even if A was used at 1.5 kg/ha, the damage rate was 60.10 for Yaemugura and Sengaric, and B was 1.5 kg/ha.
kg/ha for the same plant even if used
Shows only 5 effects.

That is, as mentioned in Example 1, the herbicidal effect, that is, the damage effect, is desired to be a value of 100 or close to it, so if you want to obtain a higher damage effect, that is, a damage effect of 100 or close to it, using this amount is quite difficult. It is clear that the quantity is insufficient.

In this case, it is naturally predicted that increasing the amount of B, which has a high damaging effect on garlic, will cause more damage to useful plants, and use of more than 1.5 kg/ha should be avoided.

By the way, as shown in the lower column of Table 3, when Agents A and B are used as a mixture, when each agent is used alone, it does not show the desired effect as a herbicide, that is, the total amount is 1. Even if 0.5 kg/ha was used, the damage rate was 100.80 for Jaeger and Garlic, and all useful plants were not damaged.

And, regardless of whether the blending ratio A:B is 1:2.1:1.2:1, almost the same effect on undesirable plants is shown.

This shows that by mixing both sides, there is not only a significant mutual effect but also a qualitative change in the effect.

As described above, the mixture of benzothiothiazinone and substituted benzoic acid according to the present invention mutually enhances herbicidal efficacy, exhibits a remarkable synergistic effect, and significantly reduces the amount of each drug used as a single agent. This invention is extremely useful in agriculture.

Claims (1)

[Claims] 1. Compounds of formula (a) (wherein R means a lower alkyl residue having up to 4 carbon atoms) or a salt thereof and formula (b) (wherein X is halogen, methoxy or amino, n
means 1.2.3 or 4, in which case methoxy and halogen or amino and halogen or methoxy, amino and halogen can be present simultaneously. ) A herbicide characterized by containing a mixture of the following compounds. 23-Inglovir-2,1,3-benzothiazinone-
(4) The herbicide according to claim 1, which contains a mixture of -2,2 dioxide and 3,6-dichloro-2-methoxybenzoic acid, or a salt of this acid. 3 The weight ratio of 3-Inglovir-2,1,3-benzothiadiazinone-(4-)-2,2-dioxide and 3,6-dichloro-2-methoxybenzoic acid or a salt of this acid is 1:3 -3:1 part herbicide according to claim 2i.